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Case Study:

Prevent Live Steam Loss


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Customer Details

Paper Machine #3 of a Kraft Paper Company in Ho Chi Minh City, Vietnam
Problems
- Heavy steam loss
- High SSC of ~ 2 T/T
- Manual steam pressure control
- Paper overheating and breakage
- Low condensate recovery factor
Objective

- To prevent live steam loss and properly utilize flash steam
- To optimise paper machine speed and capacity
- To maximise condensate recovery factor
- To reduce SSC to 1.9 T/T
Solution

Forbes Marshall carried out a detailed study of the plant,
determined areas of concern and redesigned the entire
steam system. Following changes were implemented in the
new design
- SteaMon vortex flowmeter for steam flow monitoring
incorporated
- The 26 MF dryers were divided into 06 thermal groups,
with 06 individual pressure control stations and
PID-based control valves
- Steam header for thermal groups equipped with compact
module thermodynamic trap, air vent, pressure gauge and
piston valve
- Each of the MF dryers equipped with a complete single
orifice float trap based steam trapping solution
- Separate flash vessels to optimize flash steam recovery
at pre-section and post-section
- Multivalve steam operated condensate pump MV55 to
pump hot condensate
Benefits
- Significant reduction in SSC - committed was 1.9 T/T;
actual SSC after implementation is 1.3-1.4 T/T
- Accurate steam metering
- Improved paper quality
- Increase in daily and monthly paper yield
- Flexible operation
- Safer and cleaner site
- 90% condensate recovery factor, with no additional
electricity costs